A structure for preventing permanent magnet motor from losing magnetism

Abstract

The utility model relates to the technical field of permanent magnet motors, and specifically to a structure for preventing the magnetic properties of permanent magnet motors from falling off; the structure comprises an iron core, wherein the inner ring wall of the iron core is provided with a winding slot; the utility model cooperates with a blocking block and an arc-shaped slot, so that the blocking block can increase the contact area between the slot wedge and the winding slot, and reduce the displacement of the slot wedge caused by vibration or centrifugal force; and the edge of the triangular blocking block can limit the lateral displacement of the slot wedge, and prevent it from sliding out of the winding slot; and the setting of the arc-shaped slot can disperse the stress caused by centrifugal force and vibration, thereby reducing stress concentration and reducing the risk of the slot wedge falling off; and the curved surface of the arc-shaped slot increases the contact area between the convex strip and the blocking block, thereby maintaining the clamping stability of the slot wedge; thereby reducing the risk of the slot wedge falling off, avoiding scratches on the coil caused by the falling slot wedge, preventing the stator core from being short-circuited at multiple points, and causing a winding to ground fault, so as to ensure the normal and stable use of the winding.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a structure for preventing permanent magnet motors from losing their magnetism. Background Art

[0002] A permanent magnet motor is a motor that uses permanent magnets to provide a magnetic field. Unlike traditional motors that use electromagnets to generate magnetic fields, the magnetic field in a permanent magnet motor is provided by fixed permanent magnets. This design makes the motor more efficient and energy-saving. The slot wedge is a necessary component in the motor winding process. Its main function is to fix the coil embedded in the iron core to prevent it from moving in the slot, including preventing the coil from popping out of the slot.

[0003] However, the motor will generate vibration and centrifugal force during operation. These stresses may cause the slot wedges to gradually loosen or fall off. Especially when the motor is running at high speed or under heavy load, the slot wedges are subjected to greater force and are prone to fall off. The loose or falling slot wedges can easily scratch the insulation layer of the coil, causing multiple short circuits in the stator core and winding to ground faults. In severe cases, the windings may heat up locally, burn the insulation, short circuit to the ground, and eventually explode and collapse the windings.

[0004] In view of this, in order to overcome the above technical problems, the utility model proposes a structure for preventing the permanent magnet motor from losing its magnetism, thereby solving the above technical problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art, the utility model proposes a structure for preventing the magnetic detachment of a permanent magnet motor. The utility model cooperates with a blocking block and an arc-shaped groove, so that the blocking block can increase the contact area between the slot wedge and the winding slot, and reduce the displacement of the slot wedge caused by vibration or centrifugal force; and the edge of the triangular blocking block can limit the lateral displacement of the slot wedge, and prevent it from sliding out of the winding slot; and the setting of the arc-shaped groove can disperse the stress caused by centrifugal force and vibration, thereby reducing stress concentration and reducing the risk of the slot wedge falling off; and the curved surface of the arc-shaped groove increases the contact area between the convex strip and the blocking block, thereby maintaining the clamping stability of the slot wedge; thereby reducing the risk of the slot wedge falling off, avoiding scratches on the coil caused by the falling slot wedge, preventing multiple short circuits of the stator core, and causing winding to ground faults, so as to ensure the normal and stable use of the winding.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a structure for preventing the magnetic shedding of a permanent magnet motor, comprising an iron core, an inner ring wall of the iron core being provided with a winding slot; a slot wedge being slidably and sealably connected in the winding slot; a blocking block being fixedly connected to the side wall of the winding slot; the blocking block being shaped as a triangle; a side of the slot wedge close to the blocking block being provided with an inclined surface; a side of the blocking block close to the bottom of the winding slot being provided with an arc-shaped slot; a convex strip being fixedly connected to the inclined surface of the slot wedge; the slot wedge being slidably and sealably connected in the arc-shaped slot through the convex strip; a sliding groove being provided on the side of the winding slot away from the arc-shaped groove; and the slot wedge being slidably connected in the sliding groove.

[0007] Preferably, the shape of the slide groove is set to be semicircular; the end of the groove wedge away from the convex strip is set to be semicircular; and the semicircular end of the groove wedge is slidably connected in the slide groove.

[0008] Preferably, the shape of the slide groove is set to be a rectangle; and the end of the groove wedge away from the convex strip is set to be a rectangular end.

[0009] Preferably, a groove is provided on the side wall of the slide; an insertion rod is connected in a sliding seal in the groove; the insertion rod is connected to the bottom of the groove by a connecting spring; a circular groove connected to the slide is provided at the upper end of the iron core; a round rod is installed in the groove; a push block is slidably connected in the groove; a side of the push block close to the insertion rod is set as an inclined surface; the push block is rotatably connected to the round rod; the lower end surface of the slot wedge is set as an inclined surface; and a slot matching the push block is provided at one end of the slot wedge close to the push block.

[0010] Preferably, the surface of the round rod is fixedly connected with thread teeth; the inner wall of the circular groove is provided with a thread groove; and the round rod is threadedly connected in the thread groove through the thread teeth on the surface.

[0011] Preferably, a strip groove is formed at one end of the round rod away from the push block.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model cooperates with the blocking block and the arc groove, so that the blocking block can increase the contact area between the slot wedge and the winding slot, and reduce the displacement of the slot wedge caused by vibration or centrifugal force; and the edge of the triangular blocking block can limit the lateral displacement of the slot wedge to prevent it from sliding out of the winding slot; and the setting of the arc groove can disperse the stress caused by centrifugal force and vibration, thereby reducing stress concentration and reducing the risk of the slot wedge falling off; and the curved surface of the arc groove increases the contact area between the convex strip and the blocking block, thereby maintaining the clamping stability of the slot wedge; thereby reducing the risk of the slot wedge falling off, avoiding the fallen slot wedge from scratching the coil, preventing the stator core from short-circuiting at multiple points, and causing the winding to ground fault, so as to ensure the normal and stable use of the winding.

[0014] The utility model provides a strip groove, so that when the slot wedge needs to be replaced or removed, the user can insert a tool such as a flat screwdriver into the strip groove, and then rotate the flat screwdriver so that the flat screwdriver can push the round rod to rotate in the opposite direction through the groove wall of the strip groove, so that the round rod can drive the screw thread and spiral out of the thread groove, so that the push block no longer blocks the insertion rod, and the insertion rod enters the groove under the pull of the restoring force of the connecting spring, thereby facilitating the user to take the slot wedge out of the sliding groove, reducing the difficulty of replacing and removing the slot wedge for the user, and further improving the practical application effect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0016] Figure 1 It is a three-dimensional diagram of the utility model in which the slideway is arranged in a semicircular shape;

[0017] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0018] Figure 3 It is a partial stereogram of the utility model in which the slideway is arranged in a rectangular shape;

[0019] Figure 4 It is a schematic diagram of the local structure in which the slideway is set as a rectangle in the utility model;

[0020] Figure 5 yes Figure 2 The enlarged view of point B in the middle;

[0021] Figure 6 yes Figure 2 Enlarged view of point C in the middle;

[0022] In the figure: 1, iron core; 11, winding groove; 12, blocking block; 13, arc groove; 14, slide groove; 15, groove; 151, plug rod; 16, connecting spring; 17, threaded groove; 2, slot wedge; 21, convex strip; 22, round groove; 23, round rod; 24, push block; 25, slot; 26, screw thread; 27, strip groove. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figures 1 to 6 As shown, the structure for preventing the permanent magnet motor from losing its magnetism described in the utility model includes the following implementation modes:

[0025] Embodiment 1: A structure for preventing magnetic shedding of a permanent magnet motor comprises an iron core 1, wherein the inner ring wall of the iron core 1 is provided with a winding slot 11; a slot wedge 2 is connected in a sliding seal in the winding slot 11; a blocking block 12 is fixedly connected to the side wall of the winding slot 11; the blocking block 12 is shaped as a triangle; a side of the slot wedge 2 close to the blocking block 12 is provided with an inclined surface; a side of the blocking block 12 close to the bottom of the winding slot 11 is provided with an arc groove 13; a convex strip 21 is fixedly connected to the inclined surface of the slot wedge 2; the slot wedge 2 is connected in a sliding seal in the arc groove 13 through the convex strip 21; a sliding groove 14 is provided on the side of the winding slot 11 away from the arc groove 13; the slot wedge 2 is slidably connected in the sliding groove 14.

[0026] In this embodiment, the shape of the slide groove 14 is set to be semicircular; the end of the slot wedge 2 away from the convex strip 21 is set to be semicircular; the semicircular end of the slot wedge 2 is slidably connected in the slide groove 14;

[0027] When working, the existing motor will generate vibration and centrifugal force during operation. These stresses may cause the slot wedge 2 to gradually loosen or fall off. Especially when running at high speed or under heavy load, the slot wedge 2 is subjected to great force and is easy to fall off. The loosening or falling of the slot wedge 2 may easily scratch the insulation layer of the coil, causing multiple short circuits in the stator core 1, leading to winding to ground faults. In severe cases, the winding may heat up locally, burn the insulation, short circuit to the ground, and finally explode and collapse the winding.

[0028] In this regard, the utility model cooperates with the blocking block 12 and the arc groove 13, so that the blocking block 12 can increase the contact area between the slot wedge 2 and the winding slot 11, and reduce the displacement of the slot wedge 2 caused by vibration or centrifugal force; and the edge of the triangular blocking block 12 can limit the lateral displacement of the slot wedge 2 to prevent it from sliding out of the winding slot 11; and the setting of the arc groove 13 can disperse the stress caused by centrifugal force and vibration, thereby reducing stress concentration and reducing the risk of the slot wedge 2 falling off; and the curved surface of the arc groove 13 increases the contact area between the convex strip 21 and the blocking block 12, thereby maintaining the clamping stability of the slot wedge 2; thereby reducing the risk of the slot wedge 2 falling off, avoiding the fallen slot wedge 2 from scratching the coil, preventing the stator core 1 from short-circuiting at multiple points, and causing the winding to ground fault, so as to ensure the normal and stable use of the winding;

[0029] In the initial state, the end of the blocking block 12 close to the winding slot 11 is set as an inclined surface, and the cross-sectional shape of the convex strip 21 is the same as the cross-sectional shape of the arc-shaped slot 13. When the coil is filled in the winding slot 11 of the iron core 1; the user inserts the slot wedge 2 into the winding slot 11 through the upper end of the winding slot 11, so that the inclined surface of the slot wedge 2 slides in contact with the inclined surface of the end of the blocking block 12 close to the winding slot 11. At this time, the convex strip 21 of the slot wedge 2 is directly opposite to the arc-shaped slot 13, because the end of the slot wedge 2 away from the convex strip 21 and the slide groove 14 are both set as semicircular; so when the slot wedge 2 is inserted into the winding slot 11 from above, the convex strip 21 is located at the notch of the arc-shaped slot 13, and the semicircular end of the slot wedge 2 is located at the notch of the slide groove 14. As the user uses a tool to push the slot wedge 2 into the winding slot 11, the slot wedge 2 drives the convex strip 21 fixed thereto to insert into the arc-shaped slot 13, and the slot wedge 2 The semicircular end is inserted into the slide groove 14; when the slot wedge 2 is fully inserted into the winding slot 11, the slot wedge 2 is blocked by the blocking block 12 and is located in the winding slot 11, and the coil filled in the winding slot 11 is blocked; because the triangular blocking block 12 slides in contact with the inclined surface of the slot wedge 2 through the inclined surface, the contact area between the blocking block 12 and the slot wedge 2 is increased, thereby reducing the displacement of the slot wedge 2 caused by vibration or centrifugal force, and the edge of the triangular blocking block 12 can limit the lateral displacement of the slot wedge 2 to prevent it from sliding out of the winding slot 11, thereby avoiding the problem of the slot wedge 2 falling off; and the coordination of the arc groove 13 and the convex strip 21 makes the curved surface of the arc groove 13 increase the contact area between the convex strip 21 and the blocking block 12, thereby maintaining the clamping stability of the slot wedge 2; thereby reducing the risk of the slot wedge 2 falling off, ensuring the normal and stable use of the winding;

[0030] Embodiment 2 is different from Embodiment 1 in that:

[0031] The shape of the slide groove 14 is set to be a rectangle; the end of the slot wedge 2 away from the convex strip 21 is set to be a rectangular end.

[0032] In this embodiment, a groove 15 is provided on the side wall of the slide groove 14; a plug rod 151 is slidably and sealedly connected in the groove 15; the plug rod 151 is connected to the bottom of the groove 15 by a connecting spring 16; a circular groove 22 connected to the slide groove 14 is provided at the upper end of the iron core 1; a round rod 23 is installed in the groove 15; a push block 24 is slidably connected in the groove 15; a side of the push block 24 close to the plug rod 151 is set as an inclined surface; the push block 24 is rotatably connected to the round rod 23; the lower end surface of the slot wedge 2 is set as an inclined surface; the end of the slot wedge 2 close to the push block 24 is provided with a slot 25 matching the push block 24.

[0033] In this embodiment, a threaded tooth 26 is fixedly connected to the surface of the round rod 23; a threaded groove 17 is formed on the inner wall of the circular groove 22; and the round rod 23 is threadedly connected in the threaded groove 17 through the threaded tooth 26 on the surface.

[0034] In this embodiment, a strip groove 27 is formed at one end of the round rod 23 away from the push block 24;

[0035] During operation, in the initial state, the insertion rod 151 is located in the groove 15 due to the pulling force of the connecting spring 16, and the round rod 23 drives the surface screw thread 26 to be located above the round groove 22. At this time, the push block 24 contacts the insertion rod 151, and the user inserts the slot wedge 2 into the winding groove 11 from top to bottom, and the end of the slot wedge 2 with the inclined surface faces the winding groove 11, so that during the insertion of the slot wedge 2 into the winding groove 11, the slot wedge 2 drives the convex strip 21 to be inserted into the arc groove 13, and the rectangular end of the slot wedge 2 is inserted into the slide groove 14; during the insertion of the rectangular end of the slot wedge 2 into the slide groove 14, because the insertion rod 151 is located in the groove 15, the insertion rod 151 will not The slot wedge 2 is prevented from entering the slide groove 14. When the slot wedge 2 is completely entered into the slide groove 14, the insertion rod 151 is opposite to the card slot 25. At this time, the user first pushes the round rod 23 to drive the screw teeth 26 on the surface to the notch of the thread groove 17, and then rotates the round rod 23, so that the round rod 23 drives the screw teeth 26 to rotate, so that the screw teeth 26 rotate and enter the thread groove 17, so that the round rod 23 is threadedly connected with the thread groove 17 through the screw teeth 26 on the surface. In the process of the round rod 23 rotating into the thread groove 17, the round rod 23 and the push block 24 are in rotation contact, and are pushed by the round rod 23, so that the push block 24 can continue to approach the lower end surface of the groove 15, so that the push block 24 can be pushed into the groove 17. The block 24 exerts a pushing effect on the insertion rod 151 through the inclined surface; the pushing block 24 pushes the insertion rod 151 out of the groove 15 and into the slot 25. At this time, the pushing block 24 also blocks the insertion rod 151, so that the insertion rod 151 extending out of the groove 15 will not enter the groove 15 due to the centrifugal force; the insertion rod 151 entering the slot 25 can stably fix the slot wedge 2 in the slide groove 14, thereby preventing the slot wedge 2 from loosening and falling off in the slide groove 14 due to the influence of centrifugal force and vibration, thereby ensuring that the slot wedge 2 can be firmly fixed in the slide groove 14; and the provision of the strip groove 27 is to replace or remove the slot wedge 2 when it is necessary. When the user wants to remove the slot wedge 21 from the guide groove 14, the user can insert a tool such as a flat-blade screwdriver into the strip groove 27, and then rotate the flat-blade screwdriver so that the flat-blade screwdriver can push the round rod 23 to rotate in the opposite direction through the groove wall of the strip groove 27, so that the round rod 23 can drive the screw thread 26 and spirally extend out of the thread groove 17, so that the push block 24 no longer blocks the insertion rod 151, and the insertion rod 151 enters the groove 15 under the pull of the restoring force of the connecting spring 16, thereby facilitating the user to remove the slot wedge 2 from the slide groove 14, reducing the difficulty of the user in replacing and disassembling the slot wedge 2, and further improving the practical application effect of the utility model.

[0036] The specific workflow is as follows:

[0037] Embodiment 1: In the initial state, the end of the blocking block 12 close to the winding slot 11 is set as an inclined surface, and the cross-sectional shape of the convex strip 21 is the same as the cross-sectional shape of the arc-shaped slot 13. When the coil is filled in the winding slot 11 of the iron core 1; the user inserts the slot wedge 2 into the winding slot 11 through the upper end of the winding slot 11, so that the inclined surface of the slot wedge 2 slides in contact with the inclined surface of the end of the blocking block 12 close to the winding slot 11. At this time, the convex strip 21 of the slot wedge 2 is directly opposite to the arc-shaped slot 13, because the end of the slot wedge 2 away from the convex strip 21 and the slide groove 14 are both set as semicircular; therefore, when the slot wedge 2 is inserted into the winding slot 11 from above, the convex strip 21 is located at the notch of the arc-shaped slot 13, and the semicircular end of the slot wedge 2 is located at the notch of the slide groove 14. As the user uses a tool to push the slot wedge 2 into the winding slot 11, the slot wedge 2 drives the convex strip 21 fixed thereto to insert into the arc-shaped slot 13, and the slot The semicircular end of the wedge 2 is inserted into the slide groove 14; when the slot wedge 2 is fully inserted into the winding slot 11, the slot wedge 2 is blocked by the blocking block 12 and is located in the winding slot 11, and the coil filled in the winding slot 11 is blocked; because the triangular blocking block 12 slides in contact with the inclined surface of the slot wedge 2 through the inclined surface, the contact area between the blocking block 12 and the slot wedge 2 is increased, thereby reducing the displacement of the slot wedge 2 caused by vibration or centrifugal force, and the edge of the triangular blocking block 12 can limit the lateral displacement of the slot wedge 2 to prevent it from sliding out of the winding slot 11, thereby avoiding the problem of the slot wedge 2 falling off; and the cooperation between the arc groove 13 and the convex strip 21 makes the curved surface of the arc groove 13 increase the contact area between the convex strip 21 and the blocking block 12, thereby maintaining the clamping stability of the slot wedge 2; thereby reducing the risk of the slot wedge 2 falling off, ensuring the normal and stable use of the winding;

[0038] Embodiment 2: In the initial state, the insert rod 151 is located in the groove 15 due to the pulling force of the connecting spring 16, and the round rod 23 drives the screw thread 26 on the surface to be located above the round groove 22. At this time, the push block 24 contacts the insert rod 151, and the user inserts the slot wedge 2 into the winding groove 11 from top to bottom, and the end of the slot wedge 2 with the inclined surface faces the winding groove 11, so that during the process of inserting the slot wedge 2 into the winding groove 11, the slot wedge 2 drives the convex strip 21 to be inserted into the arc groove 13, and the rectangular end of the slot wedge 2 is inserted into the slide groove 14; during the process of inserting the rectangular end of the slot wedge 2 into the slide groove 14, because the insert rod 151 is located in the groove 15, the insert rod 151 does not The slot wedge 2 will be blocked from entering the slide groove 14. When the slot wedge 2 is completely inserted into the slide groove 14, the insertion rod 151 is opposite to the card slot 25. At this time, the user first pushes the round rod 23 to drive the screw teeth 26 on the surface to the notch of the thread groove 17, and then rotates the round rod 23, so that the round rod 23 drives the screw teeth 26 to rotate, so that the screw teeth 26 rotate and enter the thread groove 17, so that the round rod 23 is threadedly connected with the thread groove 17 through the screw teeth 26 on the surface. In the process of the round rod 23 rotating into the thread groove 17, the round rod 23 and the push block 24 are in rotational contact, and are pushed by the round rod 23, so that the push block 24 can continue to approach the lower end surface of the groove 15, so that The push block 24 pushes the insertion rod 151 through the inclined surface; the push block 24 pushes the insertion rod 151 out of the groove 15 and into the slot 25. At this time, the push block 24 also blocks the insertion rod 151, so that the insertion rod 151 extending out of the groove 15 will not enter the groove 15 due to the centrifugal force; the insertion rod 151 entering the slot 25 can stably fix the slot wedge 2 in the slide groove 14, thereby preventing the slot wedge 2 from loosening and falling off in the slide groove 14 due to the influence of centrifugal force and vibration, thereby ensuring that the slot wedge 2 can be firmly fixed in the slide groove 14; and the provision of the strip groove 27 is to replace or remove the slot wedge 2 when it is necessary. When the user wants to remove the slot wedge 21 from the guide groove 14, the user can insert a tool such as a flat-blade screwdriver into the strip groove 27, and then rotate the flat-blade screwdriver so that the flat-blade screwdriver can push the round rod 23 to rotate in the opposite direction through the groove wall of the strip groove 27, so that the round rod 23 can drive the screw thread 26 and spirally extend out of the thread groove 17, so that the push block 24 no longer blocks the insertion rod 151, and the insertion rod 151 enters the groove 15 under the pull of the restoring force of the connecting spring 16, thereby facilitating the user to remove the slot wedge 2 from the slide groove 14, reducing the difficulty of the user in replacing and disassembling the slot wedge 2, and further improving the practical application effect of the utility model.

[0039] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0040] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A structure for preventing permanent magnet motor from losing its magnetic properties, characterized in that: The invention comprises an iron core (1), wherein an inner ring wall of the iron core (1) is provided with a winding slot (11); a slot wedge (2) is slidably and sealably connected in the winding slot (11); a blocking block (12) is fixedly connected to the side wall of the winding slot (11); the blocking block (12) is shaped as a triangle; a side of the slot wedge (2) close to the blocking block (12) is provided with an inclined surface; a side of the blocking block (12) close to the bottom of the winding slot (11) is provided with an arc-shaped slot (13); a convex strip (21) is fixedly connected to the inclined surface of the slot wedge (2); the slot wedge (2) is slidably and sealably connected in the arc-shaped slot (13) via the convex strip (21); a sliding slot (14) is provided on the side of the winding slot (11) away from the arc-shaped slot (13); the slot wedge (2) is slidably connected in the sliding slot (14).

2. The structure for preventing magnetic loss of a permanent magnet motor according to claim 1, characterized in that: The shape of the slide groove (14) is set to be semicircular; the end of the slot wedge (2) away from the convex strip (21) is set to be semicircular; the semicircular end of the slot wedge (2) is slidably connected in the slide groove (14).

3. The structure for preventing magnetic loss of a permanent magnet motor according to claim 1 is characterized in that: The shape of the slide groove (14) is set to be a rectangle; the end of the slot wedge (2) away from the convex strip (21) is set to be a rectangular end.

4. The structure for preventing magnetic loss of a permanent magnet motor according to claim 3 is characterized in that: The side wall of the slide groove (14) is provided with a groove (15); a plug rod (151) is slidably sealed in the groove (15); the plug rod (151) is connected to the groove bottom of the groove (15) via a connecting spring (16); a circular groove (22) connected to the slide groove (14) is provided at the upper end of the iron core (1); a round rod (23) is installed in the groove (15); a push block (24) is slidably connected in the groove (15); a surface of the push block (24) close to the plug rod (151) is arranged as an inclined surface; the push block (24) is rotatably connected to the round rod (23); the lower end surface of the slot wedge (2) is arranged as an inclined surface; the end of the slot wedge (2) close to the push block (24) is provided with a slot (25) matching with the push block (24).

5. The structure for preventing magnetic loss of a permanent magnet motor according to claim 4 is characterized in that: The surface of the round rod (23) is fixedly connected with a screw thread (26); the inner wall of the circular groove (22) is provided with a screw thread groove (17); the round rod (23) is threadedly connected in the screw thread groove (17) through the screw thread (26) on the surface.

6. The structure for preventing magnetic loss of a permanent magnet motor according to claim 5, characterized in that: A strip groove (27) is formed at one end of the round rod (23) away from the push block (24).

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